The issue is the self reliance on:
- basic safety.
- heating.
- water.
- food.
- power.
My point here is that a lot of complex systems (such as power generators) have a very limited life time, hence you either need the uber reliable systems (such as a long term solid nuclear power plant design with no moving parts in it and 0 maintenance life time of hundreds of years) or some sort of industrial capacity to keep your technology going (and replace it as it wears out).
However if it is a limited time period we are talking about (up to several years) then nothing could beat an old fashioned fall out shelter sufficiently stocked with expendables and with reliable equipment (water, air filters, power generator).
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